Final answer:
Steve's number 1 serving basic is to practice portion control by being conscious of serving sizes and using nutrition facts labels to guide food portions.
Step-by-step explanation:
The number 1 serving basic according to Steve is to practice portion control. Portion control involves being aware of the recommended serving sizes, which can often be much less than what people typically consume. This awareness can prevent overeating and contribute to better nutritional choices. To assist with portion control, it is useful to reference nutrition facts labels and use serving size guides as a means to gauge the right amount of food.